microbiology
Satellite colonies around a large colony
Why tiny colonies ring a large one on ampicillin, and how that halo differs from kanamycin plates poured for cloning strains.
8 October 2026 · 9 min read
Knowledge centre
Methods a laboratory can check.
Guides, method explainers and sourcing notes for research laboratories. Written by the EVRINTH Editorial Team from published methods, with catalogue links for enquiry rather than stock claims.
All topicsBuffers and laboratory water26Cell culture26Chromatography26Cold chain and sample storage26Cytometry and microscopy26DNA sequencing26Gels and blotting26Gene expression26Genome editing26Immunoassays26Laboratory labware26Laboratory safety26Liquid handling26Microbiology26Molecular cloning26Nucleic acid purification26PCR and amplification26Protein biochemistry26Proteomics26Research sourcing and study design26
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520 articles
cytometry and microscopy
Scale bars and what an image can claim
How a calibrated scale bar, a linear lookup table and an unsaturated image decide what a research fluorescence figure may claim.
8 October 2026 · 7 min read
chromatography
Scaling a prep from a scout column
Scale a prep from a scout column by holding bed height and linear velocity, scaling load with volume, and not copying pressure.
8 October 2026 · 7 min read
gels and blotting
SDS-PAGE for protein size estimates
Plan an SDS-PAGE size estimate: stacking and resolving gels, SDS and reduction, apparent mass, and a ladder you do not read past.
8 October 2026 · 9 min read
genome editing
Selecting edited clones without fooling yourself
Resistance and a fluorescent marker select for a cassette or a transfection, not for a sequenced allele. This page names the traps in clone picking.
8 October 2026 · 8 min read
liquid handling
Serological pipettes are a different tool
Tell a blow-out serological pipette from a micropipette, use a controller, and retire a cracked pipette before it delivers a wrong millilitre.
8 October 2026 · 7 min read
cell culture
Serum-free media as a concept
What serum-free and chemically defined media claim, why a sudden swap selects or kills cells, and how to adapt a line with a serum-grown backup.
8 October 2026 · 9 min read
liquid handling
Service intervals are not a guess from the internet
Set a pipette service interval from usage, liquids, and the manufacturer recommendation, and check a dropped pipette before it returns.
8 October 2026 · 6 min read
research sourcing
Service scopes sample numbers and data formats
Lock sample number, sample type, included steps, data format, and exclusions so an outsourced study quotation can be read line by line.
8 October 2026 · 9 min read
laboratory safety
Sharps and glass pasteur pipettes
A glass Pasteur pipette is a sharp in the middle of an ordinary transfer. Substitution and the waste stream are institutional decisions.
8 October 2026 · 9 min read
cold chain
Shipping documentation is a carrier and legal question
A courier slip is not a dangerous-goods declaration. Dry-ice paperwork is a carrier and institutional question, not a brochure approval.
8 October 2026 · 8 min read
nucleic acid purification
Silica columns versus magnetic beads
Choose a silica column or magnetic beads from debris load, plate throughput and fragment length, since both often share the same bind-wash-elute chemistry.
8 October 2026 · 9 min read